| Project/Area Number |
15K07572
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Aquatic life science
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| Research Institution | Miyagi University of Education |
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Principal Investigator |
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| Research Collaborator |
Shimizu Munetaka
Yada Takashi
Hiroi Junya
Schreck Carl
Noakes David
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | サクラマス / マスノスケ / 降海期多型 / スモルト / 銀化変態 / サロゲート / HSP70 / コルチゾル / 秋スモルト / 甲状腺ホルモン / 熱ショックタンパック / 好敵種苗 / 熱ショックタンパク / 行動 / 好適種苗 / テレメトリー / ホンマス |
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| Outline of Final Research Achievements |
In general, Pacific salmon such as masu and Chinook salmon undergo smoltification and seaward migration in spring. Recently, however, some populations show such phenomena in fall. According to our studies, fall smolt masu salmon show high plasma thyroid hormone levels as well as spring smolt, suggesting that fall smolt undergo the smoltification using same physiological mechanisms. Since fall smolt masu salmon showed high growth rate, it is also suggested that growth system modulate early smoltification. In Chinook salmon, furthermore, fall smolts exhibited high levels of plasma cortisol levels and HSP70 gene expression in the liver against water temperature decrease and increase. Based on these results, its is indicated that water temperature changes modulate early smoltification. We also developed the selection methods of fall smolts by use of hatchery cultured juvenile masu and Chinook salmon.
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| Academic Significance and Societal Importance of the Research Achievements |
従来よりも約半年程度早く銀化変態を行う秋スモルトを用いることで、サクラマスやマスノスケなどの海面養殖をより早期に開始することができ、これまでよりも短期間、かつ低コストで太平洋サケの中間育成を行うことができると期待される。これにより、近年外国産サーモンに押されている国内サケ養殖の活性化に繋がることが期待される。また秋にスモルト化する太平洋サケは国内外の複数の河川に自然分布していることから、これらの出現の機構を知り、将来の保全や資源管理に資することが期待される。
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